Test mDNS in CI with dockerized samba/avahi

[EmmanuelMess]

The docker compose setup is here: EmmanuelMess/samba-avahi-mDNS-quick-setup . I propose we create a test that runs it alongside a headless emulator and checks the emulator detects the samba host.

[TranceLove]

I'm also doing something similar, as a compliment to #4537 to test the impact of R8/Proguard class minification.

I preferred an approach that will kick in the Docker containers in Gradle script during local build, plus Github Actions YAML declarations of sidecar containers, with built-in variable GITHUB_ACTIONS.

This should make the development experience having less friction even if Dockers are kicking in.

With Gemini's help I made a POC at https://github.com/TeamAmaze/AmazeFileManager/tree/feature/proguard-test-improvements. Was trying to get class minification + Espresso tests to work by making a new build variant, but not working yet.

May take a look.

[TranceLove]

For the avahi part, if talking about Espresso test Gemini suggested we're better off testing the logic in Robolectric tests instead, since Android emulators shall have difficulties receiving UDP packets from the host i.e. the build machine where avahi-daemon is running, not to say the avahi-daemon's Docker container may have conflict with the host's own avahi-daemon (if there is one).

[EmmanuelMess]

Android emulators shall have difficulties receiving UDP packets from the host i.e. the build machine where avahi-daemon is running,

Why?

not to say the avahi-daemon's Docker container may have conflict with the host's own avahi-daemon (if there is one).

I think they will conflict, the idea is that the docker compose uses the host network and that the host has no avahi (otherwise it would use its own avahi, not the dockerized one).

we're better off testing the logic in Robolectric tests instead

I don't know if Robolectric correctly runs the network interface, and how easy is to craft the mDNS packages. If its already done (or particularily easy), Robolectric might be a good idea, otherwise I would test with a docker or by installing avahi and samba and running it.